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Finding the Fourth Proportional to 1,620.24, 2,236.05 and 911.99

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Solution

The fourth proportional to 1,620.24, 2,236.05 and 911.99 is: 1,258.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.24 : 2,236.05 = 911.99 : x
  2. Step 2: Convert to fraction form
    1,620.24/2,236.05 = 911.99/x
  3. Step 3: Cross multiply
    1,620.24x = 2,236.05 × 911.99
  4. Step 4: Simplify right side
    1,620.24x = 2,039,244.06
  5. Step 5: Solve for x
    x = 2,039,244.06/1,620.24
  6. Step 6: Final answer
    x = 1,258.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.